Abstract
Abstract In the present work, the influence of plastic deformation on the properties of a 3004 Al-alloy was studied with different techniques. Crystallite size, dislocation density, defect density, micro-strain, and stored dislocation energy are presented and compared for different three techniques. Methodology Many techniques for detecting defects have been developed, such as the positron annihilation lifetime technique (PALT), the positron annihilation Doppler broadening technique (PADBT), and the Vickers hardness test (HV). Implications The positron mean lifetime value of a non-deformed sample is 173±4.8 ps, which increases until the thickness reduction reaches a 10% deformation then saturated at saturation trapping of the positron in defect states with a mean of 221±5 ps. At an S-parameter of 0.3709±0.0031, a W-parameter of 0.5885±0.0057 was obtained at zero deformation: this decreases until saturation at 10% deformation. Findings A good correlation between the three techniques is observed for mean crystallite size. A good correlation was also noted between PALT and PADBT from 0 to 10% thickness reduction. HV has good correlations with PALT and PADBT from 0 to 6% thickness reduction: then a clear difference was found from 6 to 15% thickness reduction. Originality such results confirm the fact that the used technique can effects on the obtained results in some limitations.
Highlights
In the present work, the influence of plastic deformation on the properties of a 3004 Al-alloy was studied with different techniques
The second effect, the used solid solution works as obstacles intercepting the extension of geometrically necessary dislocations (GNDs), which leads to minimal storage size for dislocations; as an outcome, it impacts on (Hd)
Eq (3) can be presented for macro-hardness (H0) and micro-hardness (Hmi), considering H0 is the hardness in the H-h curve at the plateau region and Hmi is the hardness for the indentation size effect (ISE) zone [18]: H0 = hardness of internal friction (Hin) + hardness of solid solutions (Hsl) + HSSD
Summary
Abstract: In the present work, the influence of plastic deformation on the properties of a 3004 Al-alloy was studied with different techniques. Crystallite size, dislocation density, defect density, micro-strain, and stored dislocation energy are presented and compared for different three techniques. Methodology: Many techniques for detecting defects have been developed, such as the positron annihilation lifetime technique (PALT), the positron annihilation Doppler broadening technique (PADBT), and the Vickers hardness test (HV). Implications: The positron mean lifetime value of a nondeformed sample is 173±4.8 ps, which increases until the thickness reduction reaches a 10% deformation saturated at saturation trapping of the positron in defect states with a mean of 221±5 ps. Findings: A good correlation between the three techniques is observed for mean crystallite size. A good correlation was noted between PALT and PADBT from 0 to 10% thickness reduction. HV has good correlations with PALT and PADBT from 0 to 6% thickness reduction: a clear difference was found from 6 to 15% thickness reduction. Originality: such results confirm the fact that the used technique can effects on the obtained results in some limitations
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